Longitudinal Dispersion in Rivers: A Dead Zone Model Solution

by Yun-Sheng Yu, Univ of Kansas, United States,
Liu Wenzhi, Univ of Kansas, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


The longitudinal dispersion of tracer material in rivers is often analyzed based on the one-dimensional convective diffusion equation developed by G.I. Taylor. However, the persistent skewness observed in the dispersion data in rivers was not predicted in Taylor's analysis. One of the major factors in the concentration distribution is channel irregularities that create local 'dead zones.' These dead zones serve as temporary storage areas for tracer material. This paper uses the Laplace transform to solve the two coupled mass balance equations of the dead zone model and applies the model to several rivers.

Subject Headings: Rivers and streams | Hydrologic models | Dimensional analysis | Skewness | Hydrologic data | Laplace transform | Diffusion | Mass transfer

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